Rainbow Electronics AT29C256 - Manual

1
Features
• Fast Read Access Time – 70 ns
• 5-volt Only Reprogramming
• Page Program Operation
– Single Cycle Reprogram (Erase and Program)
– Internal Address and Data Latches for 64 Bytes
• Internal Program Control and Timer
• Hardware and Software Data Protection
• Fast Program Cycle Times
– Page (64 Byte) Program Time – 10 ms
– Chip Erase Time– 10 ms
• DATA Polling for End of Program Detection
• Low-power Dissipation
– 50 mA Active Current
– 300
µA CMOS Standby Current
• Typical Endurance > 10,000 Cycles
• Single 5V ± 10% Supply
• CMOS and TTL Compatible Inputs and Outputs
• Commercial and Industrial Temperature Ranges
Description
The AT29C256 is a five-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 256K of memory is organized as 32,768 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 70 ns with power dissipation of just 275 mW. When the device is
deselected, the CMOS standby current is less than 300 µA. The device endurance is
such that any sector can typically be written to in excess of 10,000 times.
256K (32K x 8)
5-volt Only
Flash Memory
AT29C256
Rev. 0046O–FLASH–06/02
PLCC and LCC Top View
Note: PLCC package pins 1 and 17 are
DON’T CONNECT.
Pin Configurations
Pin Name Function
A0 - A14 Addresses
CE Chip Enable
OE Output Enable
WE Write Enable
I/O0 - I/O7 Data Inputs/Outputs
NC No Connect
DC Don’t Connect
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A6
A5
A4
A3
A2
A1
A0
NC
I/O0
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
4 3 2 1
32 31 30
14 15 16 17 18 19 20
I/O1 I/O2 GND
DC
I/O3 I/O4 I/O5
A7 A12 WE DC VCC A14 A13
DIP Top View
TSOP Top View
Type 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
WE
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
VCC
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
OE
A11
A9
A8
A13
A14
VCC
WE
A12
A7
A6
A5
A4
A3
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2